StreamReader 和文件乱码

StreamReader 和文件乱码(转)

原文地址： http://www.cnblogs.com/LoveJenny/archive/2012/02/08/2343297.html




获取文章的编码格式:

public   static  Encoding GetEncoding( string  filePath)
         {
            if (filePath == null)
            {
                throw new ArgumentNullException("filePath");
            }
            Encoding encoding1 = Encoding.Default;
            if (File.Exists(filePath))
            {
                try
                {
                    using (FileStream stream1 = new FileStream(filePath, FileMode.Open, FileAccess.Read))
                    {
                        if (stream1.Length > 0)
                        {
                            using (StreamReader reader1 = new StreamReader(stream1, true))
                            {
                                char[] chArray1 = new char[1];
                                reader1.Read(chArray1, 0, 1);
                                encoding1 = reader1.CurrentEncoding;
                                reader1.BaseStream.Position = 0;
                                if (encoding1 == Encoding.UTF8)
                                {
                                    byte[] buffer1 = encoding1.GetPreamble();
                                    if (stream1.Length >= buffer1.Length)
                                    {
                                        byte[] buffer2 = new byte[buffer1.Length];
                                        stream1.Read(buffer2, 0, buffer2.Length);
                                        for (int num1 = 0; num1 < buffer2.Length; num1++)
                                        {
                                            if (buffer2[num1] != buffer1[num1])
                                            {
                                                encoding1 = Encoding.Default;
                                                break;
                                            }
                                        }
                                    }
                                    else
                                    {
                                        encoding1 = Encoding.Default;
                                    }
                                }
                            }
                        }
                    }
                }
                catch (Exception exception1)
                {
                    throw;
                }
                if (encoding1 == null)
                {
                    encoding1 = Encoding.UTF8;
                }
            }
            return encoding1;
        }

public   static   void  Main()
{
    List<string> lstFilePath = new List<string>()
    {
        "H:\\TestText\\ansi.txt",
        "H:\\TestText\\unicode.txt",
        "H:\\TestText\\utf8.txt"
    };
 
    foreach (string filePath in lstFilePath)
    {
        using (StreamReader reader = new StreamReader(filePath, GetEncoding(filePath)))
        {
            Console.WriteLine("读取文件" + filePath);
            Console.WriteLine(reader.ReadToEnd());
            Console.WriteLine("当前编码：" + reader.CurrentEncoding.EncodingName);
            Console.WriteLine("************************************************************");
        }
    }
}